I have got a weird issue with the label text. If set the “Hello World”, the label shows only “Hello”.
For the “Hello_World”, shows “Hello_”,
For the “HelloWorld”, is okay.
The code is simple, I am using ZephyrRTOS v2.3, so it uses LVGL v6.
Try changing LV_TXT_LINE_BREAK_LONG_LEN to 0 in lv_conf.h. It’s been a while, but if I recall correctly, this option was disabled by default in v7 due to issues like this.